This output format is the oldest still supported. It has the same layout as the current output format except for these changes:
There was a nine-character filler field preceding
BAND. This was used to hold the original band
number if it was later changed.
Two fields of five and four characters preceded the
SPEC field. The first was a species
number; this is redundant, since it is a different
representation of the same information as the
SPEC field. In database-theoretic terms,
this field is a violation of Third Normal Form. The
second field was a place to put the original species
code if it was later changed.
A three-character “old age group”
A three-character “old sex group”
A two-character “old net field”
Before 2004, there were ten micro-aging fields.
The first six (up to and including
were the same as the current format.
The last four were
NF. There was
IBP has requested that older field sets from before 2004 continue to use this format.